Sweden’s JAYS breaks into new sonic and app territory with t-JAYS Four in-ear headphones and the custom JAYS Curves iOS app for iPhone and iPad. This article may be the first you’re learning about Curves Digital Signal Processing (or DSP), but it won’t be the last time. DSP is here to stay, so brace yourself, audio fanatic.

The t-JAYS Four (abbreviated as tJ4) headphone are almost (or better than) conventional, which is a good thing. Multiple size comfortable tips and a too-small carrying case are provided in the idiosyncratic standard JAYS hard shell product packaging that we have described in prior reviews of JAYS products.

tJ4’s sharp-edged protuberances will take a bit of physical tweaking to achieve comfortable placement in your ears. I prefer the R and L speakers inserted into the corresponding ears, using JAYS’ largest tips, and with the cables looped over my ears from front to rear. Passive ambient sound isolation is good to very good.